| First find the strings of characters that are repeated in the ciphertext.The distances between consecutive occurrences of the strings are likely to be multiples of the length of the keyword. Then factors each of these numbers. If any number is repeated in the majority of these factorings, it is likely to be the length of the keyword. | |
| After finding keyword length ... | |
| We find k0 (first letter of keyword) first. Each of the characters y0, yL, y2L, | |
| y3L, y4L, ..., y(q–1)L (q ≈ n / L)have been encrypted by adding k0 . Essentially, if we restrict to these characters, we have a simple shift cipher with shift k0.) We count the frequency of each letter (A, B, ..., Z) in these q characters of the ciphertext, and divide these frequencies by q to obtain probabilities. | |
| Let W = (w0, w1, ..., w25), where w0, w1, ..., w25 are the probabilities of A, B, ..., Z in | |
| positions 0, L, 2L, ..., (q−1)L of the ciphertext. | |
| w0, w1, ..., w25 are the probabilities of A− k0, B− k0, ..., Z− k0 in | |
| the plaintext (same positions). |
| # install aws cli first and configure it with credentials and default region | |
| # the script will iterate over all regions of AWS | |
| for region in `aws ec2 describe-regions --output text | cut -f4` | |
| do | |
| echo -e "\nListing Instances in region:'$region'..." | |
| aws ec2 describe-instances --query "Reservations[*].Instances[*].{IP:PublicIpAddress,ID:InstanceId,Type:InstanceType,State:State.Name,Name:Tags[0].Value}" --output=table --region $region | |
| done |
###Online resources for learning Google Apps Script.
| FROM jenkins/jenkins:2.263.1 | |
| USER root | |
| RUN apt-get update && apt-get install -y sudo | |
| RUN echo "jenkins ALL=NOPASSWD: ALL" >> /etc/sudoers | |
| RUN apt-get install -y rsync && apt-get install -y curl | |
| RUN curl -sSL https://get.docker.com/ | sh | |
| RUN usermod -a -G staff jenkins |
| package main | |
| import ( | |
| "fmt" | |
| "github.com/anaskhan96/soup" | |
| "github.com/dustin/go-humanize" | |
| "io" | |
| "io/ioutil" | |
| "net/http" | |
| "os" |
Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly.
Docker provides the ability to package and run an application in a loosely isolated environment called a container. The isolation and security allow you to run many containers simultaneously on a given host. Containers are lightweight because they don’t need the extra load of a hypervisor, but run directly within the host machine’s kernel.
Docker provides tooling and a platform to manage the lifecycle of your containers:
https://coderwall.com/p/tk_pwa/ssh-into-a-secured-host-through-a-jump-server-and-forward-ports
ssh -v -t -L 10443:localhost:20443 <jump_server> ssh -t -L 20443:localhost:443 user@<target_server>
ssh -v -t -L 9292:localhost:9292 cloud1@10.10.10.10 ssh -t -L 9292:localhost:9292 cloud10@192.168.48.110
| for ROLEIN in $(cat remaining-roles-2 | jq -r ".Roles[] | .RoleName"); do | |
| ## filter role on pattern | |
| ROLE=$(echo $ROLEIN | grep -E "\-SR|\-MR|M-CP-X|M-CP-Y") | |
| if [ -z "$ROLE" ] | |
| then | |
| echo "" | |
| else | |
| echo role ${ROLE} |
| #!/bin/bash | |
| #name=${1:-docundotapvpc1} | |
| #region=${2:-us-east-1} | |
| #id=${1:-vpc-08343443447ef34b} | |
| #aws ec2 describe-vpcs --region ${region} | jq -r ".Vpcs[] | select(.VpcId | contains(\"${id}\")) | .VpcId" 2>/dev/null | | |
| name=testingnetwork | |
| region=ap-southeast-1 | |
| aws ec2 describe-vpcs --region ${region} | jq -r ".Vpcs[] | select(.Tags[].Value | contains(\"${name}\")) | .VpcId" 2>/dev/null | |