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Explanation: I am not sure of "সংকেত" - সংকেত means "signal"; the etymological meaning of the word "encrypt" is "to hide" not "to indicate";
Here the appropriate word seems to be কূট - which means "latent, hidden, intricate, code".
কূটায়ন means "to encode/encrypt";
কূটলিপীতে রূপান্তরণ means "to transform something into coded script/text";
কূটবদ্ধীকরণ means "the process of encryption of some text into code"